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Ep 2444077 A1 (19) & (11) EP 2 444 077 A1 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) Int Cl.: 25.04.2012 Bulletin 2012/17 A61K 31/00 (2006.01) A61K 31/215 (2006.01) A61P 3/10 (2006.01) (21) Application number: 12151969.8 (22) Date of filing: 24.01.2008 (84) Designated Contracting States: • Gollapudy, Reena, R. AT BE BG CH CY CZ DE DK EE ES FI FR GB GR 411 045 PUNE (IN) HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT • Deshpande, Supreet, K. RO SE SI SK TR 411 045 PUNE (IN) (30) Priority: 29.01.2007 IN MU19602007 (74) Representative: Ahner, Francis et al Cabinet Regimbeau (62) Document number(s) of the earlier application(s) in 20, rue de Chazelles accordance with Art. 76 EPC: 75847 Paris Cedex 17 (FR) 08720107.5 / 2 114 386 Remarks: (71) Applicant: Vlife Sciences Technologies Pvt Ltd. This application was filed on 20-01-2012 as a Pune 411 045, Maharashtra (IN) divisional application to the application mentioned under INID code 62. (72) Inventors: • Kulkarni, Sudhir, A. 411 045 PUNE (IN) (54) Pharmaceutical composition for treatment of diabetic complications (57) A method for treating diabetic complications by abetic complications, such as diabetic wounds, are dis- administration of a beta-blocker is disclosed. Diabetic closed. The present invention includes employing a top- complications arise from diabetes and have few or no ical formulation of a beta- blocker, having substantially no existing treatment options. The present invention de- antibacterial activity, to improve the process of diabetic scribes the use of a beta-blocker in the treatment of a wound healing. The present invention also involves in- diabetic. The present invention also describes the inhi- creasing the rate of collagen accumulation of the healing bition of aldose reductase, one of the chief causative fac- epithelialized tissue in the wound of a diabetic individual. tors of diabetic complications. Also provided are methods of diabetic wound healing. Compositions for treating di- EP 2 444 077 A1 Printed by Jouve, 75001 PARIS (FR) EP 2 444 077 A1 Description Field of Invention 5 [0001] A method for treating diabetic complications by administration of a beta-blocker is disclosed. Diabetic compli- cations arise from diabetes and have few or no existing treatment options. The present invention describes the use of beta-blockers in the treatment of diabetic complications. The present invention also describes the inhibition of aldose reductase, one of the chief causative factors of diabetic complications. Also provided are methods of diabetic wound healing. Compositions for treating diabetic complications, such as diabetic wounds, are disclosed. The present invention 10 includes employing a topical formulation of a beta-blocker, having substantially no antibacterial activity, to improve the process of diabetic wound healing. The present invention also involves increasing the rate of collagen accumulation of the healing epithelialized tissue in the wound of a diabetic individual. Background of Invention 15 [0002] The worldwide incidence of diabetes has increased from an estimated 30,000,000 patients in 1985 to an estimated 245,000,000 patients in 2007, and will further increase to 380,000,000 by 2025 (Source: International Diabetes Federation). The treatment cost of diabetes and diabetic complications is reaching $232,000,000,000 in 2007 and may be expected to be over $302,500,000,000 by 2025. Chronic diabetes gives rise to several diabetic complications such 20 as diabetic neuropathy, diabetic nephropathy, diabetic cardiomyopathy, diabetic retinopathy, diabetic cataract, diabetic cystopathy, diabetic corneal keratopathy, diabetic dermopathy, diabetic microangiopathy, myocardial infarction, macular edema, impaired neural conduction and diabetic wounds. [0003] Treatment of diabetic complications is independent of blood glucose level control. Thus, standard anti-diabetic drugs are not suitable as treatment options for diabetic complications. There is an immediate requirement for new 25 compositions and treatments for diabetic complications. [0004] One of the major underlying problem facing diabetics is impaired wound healing. Fifteen percent of all people with diabetes (2.6 million) are expected to develop foot ulcers during their lifetime. These ulcers tend to be chronic in nature, as they do not heal or heal extremely slowly. Currently, there are approximately 750,000 patients with diabetic foot ulcers in the United States, 980,000 in Europe and 1.1 million in the rest of the world , totaling 2.8 million patients. 30 Diabetic foot ulcers are a serious problem, as up to 25% of diabetic foot ulcers will eventually require amputation. The medical importance of diabetic wound healing cannot be overstated. The capacity to heal is central to human well being, as wound healing enables a patient to overcome traumatic injury, surgery, and wounds due to metabolic disorders such as diabetes, microbial or other physical or chemical agents. [0005] The ineffective healing of wounds is a serious problem in diabetes, contributing to increased morbidity (J.J. 35 Reynolds , British J Dermatol, 112 715-723 (1985); J.A. Galloway and C.R. Shuman, Am J Med, 34 177-191 (1963); and S.H. Pearl and I.O. Kanat, J Foot Surg, 27, 268-270 (1988)). The reparative response in wound healing is orchestrated by multiple cellular elements which work together in many ways, including infiltration of the lesion by inflammatory effector cells. Subsequent to this, fibroblastic elements together with inflammatory effector cells provide antibacterial mechanisms and promote removal of necrotic tissue, as well as the laying down of new connective tissue. A fundamental disorder of 40 glucose metabolism may disturb these complex and interactive protective processes. [0006] Previous work has suggested that cellular dysfunction in diabetic wound healing involves defective neutrophil function (J.D. Bagdade et al., Diabetes, 27, 677-681 (1978); C.M. Nolan et al., Diabetes, 27, 889-894 (1978); A.G. Mowat and J. Baum, J.Clin Invest December, 50, 2541-2549 (1971)), delayed infiltration of the wound with inflammatory cells (D.G. Greenhalgh et al., Am J Pathol, 136, 1235 (1990) and Fahey et al., Surg 214, 175-180 (1991)), decreased production 45 of collagen (W.H.Goodson and T.K. Hunt, J Anal, 124, 401-411 (1977) and W.H. Goodson and T.K. Hunt, Diabetes Apr, 35, 491-495 (1986)), and diminished activity of endogenous growth factors, such as basic fibroblast growth factor, which could provide a basis for the slower formation of granulation tissue and wound closure. [0007] Over 100 known physiologic factors contribute to wound healing deficiencies in individuals with diabetes (Oya- ma, et al. Diabetes: Research and Clinical Practice 73, 227-234 (2006); H. Brem and M. Tomic-Canic, J. Clin. Invest., 50 117, 1219-1222 (2007)). These factors include decreased or impaired growth factor production, angiogenic response, macrophage function, collagen accumulation, epidermal barrier function, quantity of granulation tissue, keratinocyte and fibroblast migration and proliferation, number of epidermal nerves, bone healing, and balance between the accumulation of extracellular matrix (ECM) components and their remodeling by metalloproteinases (MMPs). Wound healing occurs as a cellular response to injury and involves activation of keratinocytes, fibroblasts, endothelial cells, macrophages, and 55 platelets. Many growth factors and cytokines released by these cell types are needed to coordinate and maintain healing. Molecular analyses of biopsies from the epidermis of patients have identified pathogenic markers that correlate with delayed wound healing. These include the over expression of c-myc and nuclear localization of β-catenin. Coupled with a reduction in and abnormal localization of epidermal growth factor receptor (EGFR) and activation of the glucocorticoid 2 EP 2 444 077 A1 pathway, keratinocyte migration is inhibited. At the non healing edge (callus) of diabetic foot ulcers (DFUs), keratinocytes show an absence of migration, hyper proliferation, and incomplete differentiation. Fibroblasts demonstrate a phenotypic change as well as decreased migration and proliferation. [0008] The diabetic foot ulcer etiology is complex, and wound healing is often not very successful for a variety of 5 reasons. The diabetic foot ulcer’s etiology is associated with peripheral vascular disease, autonomic neuropathy and endothelial dysfunction. Metabolic conditions that are not optimal for wound-healing delay the process even more (hy- perglycemia, hyperlipidemia, hyperinsulinemia, pro-coagulative state) and may also be present. Wound healing is a complex process characterized by three overlapping phases: inflammation, tissue formation and tissue remodeling (H. Brem and M. Tomic- Canic, J. Clin. Invest., 117, 1219-1222 (2007)). This sequential process emanates by the interaction 10 of cells in the dermis and epidermis, in parallel with the release of chemical mediators from inflammatory cells, fibroblasts and keratinocytes. During tissue formation, growth factors synthesized by local and migratory cells stimulate fibroblasts to migrate into the wound where they proliferate and construct an extracellular matrix. Diabetes is known to be associated with a variety of alterations in connective tissue metabolism, as a result of which diabetics face the problem of poor wound healing. The common features observed during diabetic wound healing in rats are inflammation, slow beginning 15 of the initial healing phase which tends to prolong healing
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